Cal-Dex CMPK Injection is used as an aid in the treatment of hypocalcemia (parturient paresis, milk fever), hypomagnesemia (grass tetany), and other conditions associated with calcium, magnesium, phosphorus and potassium deficiencies in cattle. Cal-Dex CMPK Injection contains calcium, potassium, phosphorus and magnesium in a dextrose solution. The usual dose in cattle is 500 ml per 800-1000 pounds of body weight, given by IV. Calcium, magnesium, phosphorus and potassium.